Dr. Jonathan Sylvan Williams, MD
- Medicare services, 2019
- 20
- Hospital affiliations
- 1
- Industry payments
- $8,955
- Medical groups
- 4
- State license
- 1
- Practice address
- 1400 Vfw Pkwy, West Roxbury, MA 02132
- Practice phone
- Call (717) 277-6565
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Boston VA Healthcare System
West Roxbury, Massachusetts
Find Dr. Williams' professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Jonathan Sylvan Williams is an endocrinologist in West Roxbury, Massachusetts
Dr. Williams practices at Boston VA Healthcare System in West Roxbury, Massachusetts.
Dr. Williams' NPI, 1245297936, was assigned on April 27, 2006. Dr. Williams graduated from Hahnemann University College of Medicine in 1998. Dr. Williams holds Massachusetts license 204984.
- NPI
- 1245297936NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8123003928
- NPI enumeration date
- April 27, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (717) 277-6565
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 54
- Medical school graduation
- 1998
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Jonathan Sylvan Williams practices at Boston VA Healthcare System in West Roxbury, Massachusetts
Dr. Williams' primary practice is Boston VA Healthcare System, at 1400 Vfw Pkwy, West Roxbury, MA 02132 in Suffolk County. The practice phone is (717) 277-6565.
- Boston VA Healthcare System1400 Vfw Pkwy, West Roxbury, MA 02132 · Suffolk CountyPhone(717) 277-6565
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Jonathan Sylvan Williams is affiliated with 3 sites of care and 4 medical groups
Dr. Williams' primary practice is Boston VA Healthcare System in West Roxbury, Massachusetts. Dr. Williams is also affiliated with Brigham and Women's Hospital. The medical group on file is Brigham and Women's Hospital. Dmand AI also links Dr. Williams to 3 more medical groups and 1 group practice or clinic, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Jonathan Sylvan Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Boston VA Healthcare System | Available with a free account |
| +2 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Jonathan Sylvan Williams is one of 448 endocrinologists in Massachusetts
Endocrinology, diabetes and metabolism is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207RE0101X. Dr. Williams is licensed in Massachusetts.
Specialties and state licenses
- Endocrinology, diabetes and metabolism, MassachusettsPrimary
Endocrinologists near Dr. Williams
Counts of endocrinologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Jonathan Sylvan Williams billed Medicare for 20 services in 2019
CMS data shows 20 Medicare services from Dr. Williams across 1 procedure code in 2019. Medicare paid $3,460 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Williams' Medicare services by type, 2018 to 2019
- 2018
- 2019
- Office and hospital visits
- 2018: 1942019: 2090%
Dr. Williams compared with the Massachusetts median for endocrinologists, 2019
- Dr. Williams
- Massachusetts median
- Medicare services
- 20vs 40095% below
Medians across 434 endocrinologists in Massachusetts with Dmand AI profiles that report each measure.
Dr. Williams' most billed Medicare procedure codes, 2019
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Williams?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Williams and other endocrinologists in Massachusetts.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Jonathan Sylvan Williams' patients have a median age of 46
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 46, with 50% women.
Dr. Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 46
Patient panel by sex, all payers
- Women50%
- Men50%
Source: Dmand AI Patient Panel Data
How Dr. Jonathan Sylvan Williams takes part in Medicare
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Jonathan Sylvan Williams received $8,955 in industry payments from 2016 to 2025
CMS Open Payments shows 16 general payments to Dr. Williams from 9 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 43% of the total. DiaSorin Inc. paid the most, $6,463.
General payments to Dr. Williams by program year, 2016 to 2025
General payments to Dr. Williams by kind, 2016 to 2025
- Speaker and faculty fees$3,86343%
- Accredited education speaker fees$3,00034%
- Consulting fees$1,15013%
- Travel and lodging$6457%
- Food and beverage$2963%
Companies that paid Dr. Williams the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Jonathan Sylvan Williams graduated from Hahnemann University College of Medicine
Dr. Williams graduated from Hahnemann University College of Medicine in 1998.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Jonathan Sylvan Williams's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Jonathan Sylvan Williams
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Jonathan Sylvan Williams' NPI number?
Dr. Jonathan Sylvan Williams' NPI number is 1245297936. It was assigned on April 27, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Jonathan Sylvan Williams?
Dr. Jonathan Sylvan Williams is an endocrinologist in West Roxbury, Massachusetts. The primary specialty in the NPI Registry is Endocrinology, Diabetes & Metabolism Physician (taxonomy code 207RE0101X).
Where does Dr. Jonathan Sylvan Williams practice?
Dr. Williams practices at 1400 Vfw Pkwy, West Roxbury, MA 02132. Dr. Williams' primary practice is Boston VA Healthcare System in West Roxbury, Massachusetts. Dmand AI also links Dr. Williams to 3 medical groups and 1 group practice or clinic.
What is Dr. Jonathan Sylvan Williams' office phone number?
The practice phone on file for Dr. Williams is (717) 277-6565.
What is Dr. Jonathan Sylvan Williams' medical license number?
Dr. Williams holds Massachusetts license 204984.
Which hospitals is Dr. Jonathan Sylvan Williams affiliated with?
Dr. Williams is affiliated with Brigham and Women's Hospital.
What medical group is Dr. Jonathan Sylvan Williams part of?
Dr. Williams is linked to Brigham and Women's Hospital. Dmand AI links Dr. Williams to 3 more medical groups.
Does Dr. Jonathan Sylvan Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 20 services in 2019, and Dr. Williams accepts Medicare assignment.
What services does Dr. Jonathan Sylvan Williams bill to Medicare?
In 2019, Dr. Williams' most billed Medicare services were hospital inpatient care (99223).
Where did Dr. Jonathan Sylvan Williams go to medical school?
Dr. Williams graduated from Hahnemann University College of Medicine in 1998.
Has Dr. Jonathan Sylvan Williams received payments from drug or device companies?
CMS Open Payments shows $8,955 in general payments to Dr. Williams from 9 companies from 2016 to 2025. The largest total came from DiaSorin Inc.
How long has Dr. Jonathan Sylvan Williams been practicing?
Dr. Williams graduated from medical school in 1998, 28 years ago.
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